You can improve your writing by respecting your readers time. Wasting your readers time by showing them a picture of a cat isn't respecting their time.

Be concise, be upfront about what you want to say, don't make your readers work hard to understand what you're trying to say.

Your readers will also tell you about your content's quality and relevance through their visits. Check your site visits, understand if they're one time visitors or returning and figure out why that's happening.

You might also want to get a domain for your blog, it projects more of a commitment than a subdomain.